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Better Auth vs Mcp

Mcp scores higher on the AgentReady, 58/100 against 57/100. They differ on 9 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Better Auth. A framework-agnostic, universal authentication and authorization framework for TypeScript.

Mcp. MCP.so is a discovery platform for MCP (Model Context Protocol) servers, connecting AI apps to tools, data, and automated workflows.

Where Better Auth is ahead

Better Auth passes public docs discoverable, and Mcp does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: structured api reference, authentication documented and limits / constraints documented. Mcp misses those.

Where Mcp is ahead

Mcp passes clear canonical domain and llms-full.txt / full agent docs, and Better Auth does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds operate: retry behavior documented, observable execution and agent compatibility verified. Better Auth misses those.

What neither does

Both fail openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart, structured, predictable output, machine-readable errors, idempotency support, rate-limit behavior predictable. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover. Both sit at 87/100 here. Better Auth misses clear canonical domain, llms-full.txt / full agent docs; Mcp misses public docs discoverable.

Understand. Better Auth leads 54 to 23. Better Auth misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented; Mcp misses structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Better Auth leads 62 to 60. Better Auth misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart; Mcp misses no mandatory sales call, agent-compatible signup flow, programmatic credential creation, fast time to first request, copyable quickstart.

Operate is whether an agent can run against it in production and recover when a call fails. Mcp leads 61 to 24. Better Auth misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified; Mcp misses structured, predictable output, machine-readable errors, idempotency support, rate-limit behavior predictable.

Pricing

Better Auth starts at $0/month and has a free tier. Mcp starts at $399/mo with no free tier.

Signal by signal

Which to pick

Mcp clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: Better Auth and Mcp. Alternatives to each: Better Auth, Mcp.

An agent can fetch this as data: POST /v1/compare {"slugs": ["better-auth", "mcp"]}